MCQ
23961. In primary settling tank, suspended solids are reduced from-
10 to 20%
20 to 40%
40 to 70%
70 to 90%
23962. A pipe installed for ventilation purpose is called-
wash pipe
vent pipe
soil pipe
anti-siphonage pipe
23963. বঙ্গবন্ধু গ্রাম কোন নদীর তীরে অবস্থীত?
মধুমতি
বাইগার
কুমার
ভৈরব
23964. The sewage is treated by aerobic bacteria action in-
settling tank
trickling filter
oxidation pond
all of these
23965. Biological action is used in-
screens
trickling filters
sedimentation tank
all of these
23966. The presence of ---causes red colour in water.
iron
sodium fluoride
manganese
calcium carbonate
23967. বঙ্গবন্ধু কোন জেলায় জন্মগ্রহণ করেন?
খুলনা
গোপালগঞ্জ
ফরিদপুর
নড়াইল
23968. The sewage is treated by aerobic bacteria action in -
settling tank
oxidation pond
trickling filter
all of these
23969. The biochemical treatment of sewage effluent is a process of-
oxidation
self-purification
deoxidation
sedimentation
23970. In high rate activated sludge treatment, bacteria are removed from-
20 to 40%
40 to 60%
60 to 80%
80 to 95%
23971. Pre-chlorination-
reduces odours
reduces tastes
improves coagulation
all of these
23972. Grit chambers of a sewage plant are usually changed after-
1 day
2 weeks
1 week
4 weeks
23973. জাতির জনক বঙ্গবন্ধু শেখ মুজিবুর রহমান এর জন্মস্থান-
টুঙ্গিপাড়া
টঙ্গি
টাঙ্গাইল
টঙ্গিবাড়ী
23974. In one pipe system of plumbing, waste water is carried away from-
bathrooms
kitchens
wash basins
all of these
23975. A scour value, in a water distribution system, is provided at-
low points
junction points
high points
all of these
23976. Air vent pipe is not essentially required in a septic tank-
true
false
23977. The process of dechlorination is followed by-
plain
de
post
super
23978. Aerobic bacteria takes place in the of ---light.
Presence
absence
23979. জাতির পিতা বঙ্গবন্ধু শেখ মুজিবুর রহমান কোন উপজেলায় জন্মগ্রহণ করেন?
টঙ্গিবাড়ী
টঙ্গি
কোটালীপাড়া
টুঙ্গিপাড়া
23980. The anti-siphonage pipe is not required in ---system.
one pipe
single stack
two pipe
none of these